Which system is designed specifically to protect against fire spread?

The choice referring to passive fire protection systems is the correct response because these systems are specifically engineered to prevent the spread of fire and smoke within a structure. They achieve this through various methods, including the use of fire-resistant walls, ceilings, and floors, which create barriers that slow down or stop the movement of flames and heat. Additionally, passive fire protection may involve the application of fire-retardant materials and the construction of compartments that help contain a fire to a specific area, thereby enhancing the overall safety of the environment.

In contrast, the other systems listed do not focus primarily on fire containment. Electrical systems pertain to the safe installation and operation of electrical wiring and equipment, which can reduce fire risk but do not directly serve to limit fire spread once a fire starts. Cooling systems are typically used to manage temperature and may aid in preventing overheating but are not designed to contain fires. Ventilation systems can influence the movement of smoke and may be important in fire scenarios, but their main function is to regulate air flow and maintain environmental conditions, rather than specifically addressing fire spread prevention.